add icon parameter to sendWaypoint()

[pdxlocations]

closes #849

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.98%. Comparing base (dcd077d) to head (9285f7d).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
meshtastic/mesh_interface.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #851      +/-   ##
==========================================
- Coverage   59.99%   59.98%   -0.02%     
==========================================
  Files          24       24              
  Lines        4267     4268       +1     
==========================================
  Hits         2560     2560              
- Misses       1707     1708       +1     

Flag	Coverage Δ
unittests	59.98% <0.00%> (-0.02%)	⬇️

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